Your mind is supposed to be at rest at night. But, with us that have anxiety, it gives our minds a chance to relax enough from our busy daily lives to think about all the stuff that make us anxious. Like, what is going to happen tomorrow? Am I going to have another bad day tomorrow? What about next week? How am I going to get through this?
All this is now going through your (trying to relax) mind and it can't get to the point of relaxation. This is very normal. At least during the day we try and keep our minds busy and talk ourselves down from those horrific attacks. At night when we are lying in bed all alone or even with a partner, it is a perfect time for our minds to go overboard.
Usually, what I do is listen to the radio with my headset on a station with soothing music. Sometimes that really can help you mind relax to the point where you can sleep.

Carrie